KR20220145799A - Refrigerator and method for controlling the same - Google Patents

Abstract

The present invention relates to a method for controlling a refrigerator, which maintains a constant temperature in a storage compartment, thereby enhancing the freshness of stored items. The method for controlling a refrigerator according to one aspect comprises the steps in which: when the refrigerator is powered on, a control unit operates a cold air supply means at a predetermined first output value; the control unit stops the cold air supply means if a temperature in a storage compartment reaches an off-reference temperature (A2) lower than a set temperature of the storage compartment; the control unit operates the cold air supply means with a second output value lower than the predetermined first output value if the temperature in the storage compartment reaches a predetermined temperature; and the control unit adjusts the output of the cold air supply means based on an increase or decrease in the temperature in the storage compartment detected by a temperature sensor at sampling time intervals while the cold air supply means operates with the second output value.

Description

Refrigerator and method for controlling the same

The present invention relates to a method for controlling a refrigerator.

A refrigerator is a home appliance that stores food at a low temperature, and it is essential that a storage room is always maintained at a constant low temperature. Currently, in the case of home refrigerators, the storage compartment is maintained at a temperature within the upper and lower limit ranges based on the set temperature. That is, when the storage compartment temperature rises to the upper limit temperature, the refrigerator is controlled by driving the refrigeration cycle to cool the storage compartment, and stopping the refrigeration cycle when the storage compartment temperature reaches the lower limit temperature.

Korean Patent Application Laid-Open No. 1997-0022182 (published on May 28, 1997) discloses a constant temperature control method for maintaining a storage compartment of a refrigerator at a constant temperature.

According to the prior literature, when the storage room temperature is higher than the set temperature, the compressor and the fan are driven, and at the same time the storage room damper is fully opened, and when the storage room temperature is cooled to the set temperature, the operation of the compressor and/or the fan is stopped and the storage room damper characterized by closing

According to the control method of the refrigerator according to the prior art as described above, there are the following problems.

First, since the temperature of the storage compartment of the refrigerator rises above the set temperature to drive the compressor, and then the process of stopping the compressor operation is repeated when the storage compartment temperature is cooled below the set temperature, the temperature change in the storage compartment is large and stored in the storage compartment There is a problem that the freshness of food is lowered.

In addition, since the driving start and the driving stop of the compressor are repeatedly performed, there is a disadvantage in that power consumption is increased when the compressor is re-driven.

In addition, when the storage chamber damper is completely opened, there is a high possibility that cold air is excessively supplied to the storage chamber in a state in which the damper is fully opened, which may cause a problem in that the storage chamber is overcooled.

An object of the present invention is to provide a method for controlling a refrigerator in which the temperature of a storage compartment is maintained at a constant temperature in order to improve the freshness of an object to be stored.

Another object of the present invention is to provide a method for controlling a refrigerator that can reduce power consumption of a cold air supply means while maintaining the temperature of a storage room at a constant temperature.

Another object of the present invention is to provide a control method of a refrigerator capable of rapidly recovering to a steady temperature state when the temperature of a storage chamber deviates from a steady temperature state.

According to an aspect of the present invention, there is provided a control method of a refrigerator for solving the above problems, comprising: operating a cold air supply unit with a previously determined output; determining, by a controller, an output of the cold air supplying means based on the current temperature of the storage chamber sensed by the temperature sensor while the cold air supplying means operates with the previously determined output; and operating, by the control unit, the cold air supply means with the determined output.

For example, when the absolute value of the difference between the temperature of the previous storage room and the current temperature is equal to or greater than the first reference value, the control unit determines to decrease or increase the output of the cold air supply means, and detects it again after a predetermined time has elapsed When the absolute value of the difference between the current temperature of the storage chamber and the temperature of the previous storage chamber is equal to or greater than the first reference value, the output of the cold air supply means may be reduced or increased again.

For example, when the difference between the temperature of the previous storage compartment and the current temperature is greater than 0, and the absolute value of the difference between the temperature of the previous storage compartment and the current temperature is equal to or greater than the first reference value, the control unit is the cold air supply means It can be decided to decrease the output of

When the difference between the temperature of the previous storage chamber and the current temperature is less than 0, and the absolute value of the difference between the temperature of the previous storage chamber and the current temperature is equal to or greater than the first reference value, the output of the cold air supply means It can be decided to increase

The control unit, when the absolute value of the difference between the temperature of the previous storage room and the current temperature is equal to or greater than a first reference value, and is smaller than a second reference value that is greater than the first reference value, the output of the cold air supply means is reduced by a first level If the absolute value of the difference between the temperature of the previous storage room and the current temperature is greater than or equal to the second reference value, the output of the cold air supply means is set to a second level greater than the first level. It can be decided to decrease by the amount or increase by the second level.

The difference between the second reference value and the first reference value and the first reference value may be the same or different.

When an output change value of the cold air supply means corresponding to the first level is a first output change value, and an output change value of the cold air supply means corresponding to the second level is a second output change value, the A difference between the second output change value and the first output change value may be the same as or different from the first output change value.

For example, when the absolute value of the difference between the previous temperature of the storage chamber and the current temperature is smaller than the first reference value, the controller may determine to maintain the output of the cold air supply unit.

According to another aspect, there is provided a method for controlling a refrigerator, comprising: operating a cold air supply unit with a previously determined output; determining, by a controller, an output of the cold air supplying means based on the current temperature of the storage chamber sensed by the temperature sensor while the cold air supplying means operates with the previously determined output; and operating, by the control unit, the cold air supply means with the determined output, wherein the control unit, when the absolute value of the difference between the set temperature of the storage compartment and the current temperature of the storage compartment is equal to or greater than a first reference value, the cold air When it is determined to decrease or increase the output of the supply means, and after a certain time has elapsed, the absolute value of the difference between the set temperature and the current temperature of the storage room sensed again is the first reference value or more, the output of the cold air supply means can be decreased or increased again.

The first reference value includes a first upper limit reference value higher than the set temperature, the current temperature is higher than the set temperature, and the absolute value of the difference between the set temperature and the current temperature exceeds the first upper limit reference value In this case, the control unit may determine to increase the output of the cold air supply means.

The first reference value includes a first lower limit reference value higher than the set temperature, the current temperature is lower than the set temperature, and the absolute value of the difference between the set temperature and the current temperature exceeds the first lower limit reference value In this case, the control unit may determine to reduce the output of the cold air supply means.

The control unit, when the absolute value of the difference between the set temperature of the storage chamber and the current temperature of the storage chamber is equal to or greater than a first reference value and is smaller than a second reference value greater than the first reference value, the output of the cold air supply means is first If it is determined to decrease by the level or increase by the first level, and the absolute value of the difference between the set temperature and the current temperature of the storage chamber is equal to or greater than the second reference value, the output of the cold air supply means is lower than the first level Decrease by a large second level or increase by a second level may be determined.

When the absolute value of the difference between the set temperature and the current temperature of the storage chamber is smaller than the first reference value, the controller may determine to maintain the output of the cold air supply means.

According to another aspect, there is provided a method for controlling a refrigerator, comprising: operating, by a controller, a cold air supply unit with a preset first output value when power of the refrigerator is turned on; when the temperature of the storage chamber reaches an off reference temperature (A2) lower than the set temperature of the storage chamber, the control unit stopping the cold air supply means; operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and adjusting the output of the cold air supply means based on the increase/decrease in the temperature of the storage chamber sensed by the temperature sensor at sampling time intervals while the cold air supply means operates at the second output value.

When the absolute value of the difference between the previous temperature and the current temperature is smaller than the first reference value, the controller may maintain the cooling power of the cold air supply means.

When the absolute value of the difference between the previous temperature and the current temperature is equal to or greater than the first reference value, the cooling power of the cold air supply means may be increased or decreased.

According to another aspect, there is provided a method for controlling a refrigerator, comprising: operating, by a controller, a cold air supply unit with a preset first output value when power of the refrigerator is turned on; when the temperature of the storage chamber reaches the off-reference temperature A2 lower than the set temperature of the storage chamber, the control unit stopping the cold air supply means; operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and adjusting the output of the cold air supply means based on a difference value between the set temperature of the storage chamber and the current temperature of the storage chamber at sampling time intervals while the cold air supply means operates with the second output value.

The predetermined temperature may be the set temperature.

The preset first output value may be the maximum output of the cold air supply means.

The sampling time may be constant or may vary according to the current temperature.

When the current temperature is located in the first temperature section, the first sampling time may be applied as a sampling time for detecting the next current temperature.

When the current temperature is located in the second temperature section, a second sampling time longer or shorter than the first sampling time may be applied as a sampling time for detecting the next current temperature.

According to another aspect, there is provided a method for controlling a refrigerator, comprising: operating, by a controller, a cold air supply unit with a preset first output value when power of the refrigerator is turned on; stopping, by the controller, the cold air supply means when the temperature of the storage chamber reaches a predetermined value; operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and adjusting the output of the cold air supply means by the controller based on the increase/decrease in the temperature of the storage chamber sensed by the temperature sensor at sampling time intervals while the cold air supply means operates at the second output value.

The predetermined value may include an off reference temperature A2 lower than the set temperature of the storage chamber.

The predetermined temperature may include a value different from the predetermined value.

The predetermined temperature may include a value higher than the predetermined value.

According to another aspect, there is provided a method for controlling a refrigerator, comprising: operating, by a controller, a cold air supply unit with a preset first output value when power of the refrigerator is turned on; stopping, by the control unit, the cold air supply means when the temperature of the storage chamber reaches a predetermined value; operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and adjusting the output of the cold air supply means by the controller based on the difference between the set temperature of the storage chamber and the current temperature of the storage chamber at sampling time intervals while the cold air supply means is operating with the second output value. do.

The predetermined value may include an off reference temperature A2 lower than the set temperature of the storage chamber.

The predetermined temperature may include a value different from the predetermined value.

The predetermined temperature may include a value higher than the predetermined value.

According to the proposed invention, since the temperature of the storage chamber can be maintained constant, there is an advantage that the storage period of food can be extended. That is, there is an advantage in that the phenomenon that the food stored in the storage compartment is overcooled or withered can be eliminated.

In addition, in order to keep the temperature of the storage room constant, since the cold air supply means does not stop and maintains the driving state, there is an effect of reducing power consumption according to the initial start of the cold air supply means.

In addition, based on the difference between the previous temperature and the current temperature and/or the difference between the set temperature and the current temperature, the output of the cold air supply means is adjusted, so that when the temperature of the storage room is out of the steady temperature state, it is quickly restored to the steady temperature state. There are advantages to doing.

1 is a perspective view of a refrigerator according to an embodiment of the present invention;
2 is a view schematically showing the configuration of a refrigerator according to an embodiment of the present invention.
3 is a block diagram of a refrigerator of the present invention.
4 is a flowchart illustrating a control method of a refrigerator according to a first embodiment of the present invention.
5 is a graph for explaining the temperature change of the storage chamber and the output control of the cold air supply means according to the first embodiment.
6 is a flowchart illustrating a control method of a refrigerator according to a second embodiment of the present invention.
7 is a graph for explaining the temperature change of the storage chamber and the output control of the cold air supply means according to the second embodiment.
8 is a flowchart illustrating a control method of a refrigerator according to a third embodiment of the present invention.
9 to 12 are flowcharts for explaining a method for adjusting the output of the cold air supply means according to the third embodiment.
13 is a graph for explaining a temperature change of a storage chamber and output control of a cold air supply means according to the third embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but between each component another component It will be understood that may also be "connected", "coupled" or "connected".

1 is a perspective view of a refrigerator according to an embodiment of the present invention, and FIG. 2 is a diagram schematically showing the configuration of a refrigerator according to an embodiment of the present invention. 3 is a block diagram of a refrigerator of the present invention.

1 to 3 , a refrigerator 1 according to an embodiment of the present invention includes a cabinet 11 in which a storage compartment is formed, and a storage compartment door coupled to the cabinet 11 to open and close the storage compartment. can do.

The storage compartment may include a freezing compartment 111 and a refrigerating compartment 112 , and an object to be stored such as food may be stored in the freezing compartment 111 and the refrigerating compartment 112 .

The freezing compartment 111 and the refrigerating compartment 112 may be partitioned in a left-right direction or a vertical direction inside the cabinet 11 by a partition wall 113 .

The storage compartment door may include a freezing compartment door 15 for opening and closing the freezing compartment 111 and a refrigerating compartment door 16 for opening and closing the refrigerating compartment 112 . Although not limited, the refrigerating compartment door 16 may further include a sub-door 17 for withdrawing the object stored in the refrigerating compartment door 16 without opening the refrigerating compartment door 16 .

And, the partition wall 113 is provided with a connection duct (not shown) that provides a cold air passage for supplying cold air to the refrigerating chamber 112, and a damper 12 is installed in the connection duct (not shown), The connecting duct may be open or closed.

In addition, the refrigerator 1 further includes a refrigeration cycle 20 for cooling the freezing compartment 111 and/or the refrigerating compartment 112 .

In detail, the refrigeration cycle 20 includes a compressor 21 for compressing the refrigerant, a condenser 22 for condensing the refrigerant passing through the compressor 21, and a method for expanding the refrigerant passing through the condenser 22 It includes an expansion member 23 and an evaporator 24 for evaporating the refrigerant that has passed through the expansion member 23 . The evaporator 24 may include, for example, an evaporator for a freezer compartment.

In addition, the refrigerator 1 includes a fan 26 for allowing air to flow toward the evaporator 24 for circulation of cold air in the freezing compartment 111 , and a fan driving unit 25 for driving the fan 26 . may include

In the present invention, in order to supply cold air to the freezing compartment 111 , the compressor 21 and the fan driving unit 25 must operate, and in order to supply cold air to the refrigerating compartment 112 , the compressor 21 and the fan driving unit 25 . ) should work as well as the damper 12 should be open. At this time, the damper 12 may be operated by the damper driving unit 13 .

In this specification, the compressor 21 , the fan driving unit 25 , and the damper 12 (or the damper driving unit) may be referred to as “cold air supply means” that operate only to supply cold air to the storage chamber.

And, in the present specification, when the cold air supply means is the compressor 21 and the fan driving unit 25, "operating the cold air supply means" means that the compressor 21 and the fan driving unit 25 are turned on, " When the cold air supply means is "stopped", it means that the compressor 21 and the fan driving unit 25 are turned off.

In this specification, when the cold air supply means is the compressor 21 and the fan driving unit 25 , the output of the cold air supply means means the cooling power of the compressor 21 and the rotation speed of the fan driving unit 25 .

In addition, when the cold air supply means is the damper 12, "operating the cold air supply means" means that the damper 12 is opened so that cold air from the freezing compartment 111 can flow into the refrigerating chamber 112, and , “the cold air supply means is stopped” means that the damper 12 is closed and the cold air in the freezing compartment 111 does not flow into the refrigerating chamber 112 .

When the cold air supplying means is the damper 12 (or damper driving unit), increasing the output of the cold air supplying means means that the opening angle of the damper 12 is increased, and the output of the cold air supplying means is Decreasing means that the opening angle of the damper 12 is reduced.

The refrigerator 1 includes a freezing compartment temperature sensor 41 for sensing the temperature of the freezing compartment 111 , a refrigerating compartment temperature sensor 42 sensing the temperature of the refrigerating compartment 112 , and each of the temperature sensors 41 , 42) may include a control unit 50 for controlling the cold air supply means based on the detected temperature.

The control unit 50 may control one or more of the compressor 21 and the fan driving unit 25 to maintain the temperature of the freezing compartment 111 at a target temperature.

For example, the control unit 50 may increase, maintain, or decrease the outputs of the fan driving unit 25 and the compressor 21 .

In addition, the control unit 50 controls one of the compressor 21 , the fan driving unit 25 , and the damper 12 (or the damper driving unit 13 ) to maintain the temperature of the refrigerating compartment 112 at a target temperature. It is possible to increase, maintain, or decrease the output above.

For example, the control unit 50 may vary the opening angle of the damper 12 while the compressor 21 and the fan driving unit 25 operate at a constant output.

A set temperature (or target temperature) may be stored in the memory 52 . Also, the change amount of the unit cooling power according to the unit temperature may be stored in the memory 52 .

In the present specification, a temperature higher than the target temperature of the refrigerating compartment 112 may be referred to as a first refrigerating compartment reference temperature, and a temperature lower than the target temperature of the refrigerating compartment 112 may be referred to as a second refrigerating compartment reference temperature.

In addition, a temperature higher than the target temperature of the freezing compartment 111 is referred to as a first freezing compartment reference temperature, and a temperature lower than the target temperature is referred to as a second freezing compartment reference temperature.

Also, a range between the reference temperature of the first refrigerating compartment and the reference temperature of the second refrigerating compartment may be called a refrigerating compartment temperature satisfaction section. A predetermined temperature between the first refrigerating compartment reference temperature and the second refrigerating compartment reference temperature may be referred to as a first set temperature. The first set temperature may be a target temperature or an average temperature of the first refrigerating compartment reference temperature and the second refrigerating compartment reference temperature.

Also, a range between the first freezing chamber reference temperature and the second freezing chamber reference temperature may be referred to as a freezing chamber temperature satisfaction section. In addition, a predetermined temperature between the first freezing chamber reference temperature and the second freezing chamber reference temperature may be referred to as a second set temperature. The second set temperature may be a target temperature or an average temperature of the first freezing compartment reference temperature and the second freezing compartment reference temperature.

The controller 50 may control the cold air supply means so that the target temperature of the freezing compartment 111 and/or the refrigerating compartment 112 is maintained within the temperature satisfaction section.

Hereinafter, a method for controlling the constant temperature of the storage room will be described.

4 is a flowchart illustrating a control method of a refrigerator according to a first embodiment of the present invention.

Referring to FIG. 4 , when the power of the refrigerator 1 is turned on ( S1 ), the controller 50 performs a preliminary operation for controlling the constant temperature ( S2 ).

In the present specification, the cold air supply means may be turned on when the temperature of the storage chamber is equal to or greater than the on reference temperature A1, and turned off when the temperature of the storage chamber is less than or equal to the off reference temperature A2.

In general, when the refrigerator 1 is turned on or the cold air supply means is turned on in a state in which the power of the refrigerator 1 is turned off or in a state in which the cold air supply means for defrosting is turned off, the temperature of the storage compartment is set to the on reference temperature ( Since it will be higher than A1), the control unit 50 may control the cold air supply means to operate at the maximum output so that the temperature of the storage chamber can be rapidly lowered.

For example, the controller 50 may control the compressor 21 to operate with the maximum cooling power, and may allow the opening angle of the damper 12 to be maximized.

When the compressor 21 is operated with the maximum cooling power, the temperature of the storage chamber is lowered, and when the temperature of the storage chamber is below the off reference temperature A2, the controller 50 stops the compressor 21 can do it Alternatively, the control unit 50 may close the damper 12 .

That is, the preliminary operation step may include operating the cold air supply means at maximum output and stopping the cold air supply means.

During the preliminary operation of the refrigerator, the controller 50 determines whether a constant temperature control start condition is satisfied (S3).

For example, the control unit 50 may determine whether the temperature of the storage chamber reaches a set temperature in a state in which the cold air supply means is stopped.

When the cold air supply means is stopped, the temperature of the storage chamber rises, and when the temperature of the storage chamber reaches the set temperature, the controller 50 determines that the constant temperature control start condition is satisfied, control for the

When the constant temperature control start condition is satisfied, the cold air supply means is operated with a predetermined output (S4). The predetermined output is an output between a minimum output and a maximum output.

In the control step for the constant temperature, the cold air supply means may be continuously operated.

The control step for the constant temperature may include sensing the temperature of the storage chamber at regular time intervals (S5) and adjusting the output of the cold air supply means (S6).

In this embodiment, the control unit 50 may adjust the output of the cold air supply means to control the constant temperature of the storage chamber, but may adjust the output of the cold air supply means based on the temperature of the storage chamber.

Specifically, the control unit 50 determines the change in the temperature of the storage chamber and adjusts the output of the cold air supply means (S6).

In this embodiment, a difference value between the temperature of the previous storage chamber (hereinafter referred to as "previous temperature") and the current temperature of the storage chamber (hereinafter referred to as "current temperature") is used as a change in the temperature of the storage chamber.

The temperature change trend of the storage chamber is based on the temperature value of the storage chamber sensed at regular time intervals. Accordingly, the predetermined time is a sampling time for determining the temperature change trend.

In this case, the sampling time may be constant or may vary according to the current temperature. For example, when the current temperature is located in the first temperature section, the first sampling time may be applied as a sampling time for detecting the next current temperature. On the other hand, when the current temperature is located in the second temperature section, a second sampling time longer or shorter than the first sampling time may be applied as a sampling time for detecting the next current temperature.

The controller 50 continues the constant temperature control as long as the power of the refrigerator 1 is not turned off (S7).

5 is a graph for explaining the temperature change of the storage chamber and the output control of the cold air supply means according to the first embodiment.

5 shows, for example, a change in the cooling capacity of the compressor for maintaining the freezing chamber at a constant temperature state and a change in the temperature of the freezing chamber according to the change in the cooling capacity of the compressor, and the number on the graph is an example of the cooling capacity of the compressor.

Hereinafter, as an example of the cooling air supply means, the control of the cooling power of the compressor will be described.

Referring to FIG. 5 , after the power of the refrigerator is turned on or the defrosting operation is completed, the compressor 21 may be operated with the maximum cooling power to rapidly lower the temperature of the freezing compartment. And, when the temperature of the freezing chamber reaches the off reference temperature A2, the compressor 21 is stopped.

When the compressor 21 is stopped, the temperature of the freezing compartment rises, and when the temperature of the freezing compartment reaches a set temperature (Notch), control for the constant temperature of the freezing compartment is started.

When the constant temperature control of the freezing compartment is started, the compressor 21 operates with a pre-set cooling power between a minimum cooling power and a maximum cooling power.

As described above, the temperature of the freezing compartment is sensed at a sampling time interval, and the control unit 50 adjusts the cooling power of the compressor 21 based on the difference between the previous temperature and the current temperature.

For example, depending on the temperature of the freezer compartment while the compressor 21 is operating at a cooling power of 60, the cooling power is maintained (cooling power: 60), decreasing (cooling power: 55, 50), or increasing (cooling power: 65, 70) can be

For example, when the absolute value of the difference between the previous temperature and the current temperature is smaller than the first reference value, the controller 50 may maintain the cooling power of the compressor 21 .

Alternatively, when the absolute value of the difference between the previous temperature and the current temperature is equal to or greater than the first reference value, the cooling power of the compressor 21 may be increased or decreased.

For example, when the difference between the previous temperature and the current temperature is greater than 0 and the absolute value of the difference between the previous temperature and the current temperature is equal to or greater than the first reference value, the cooling power of the compressor 21 is increased by the first level. can be reduced

Alternatively, when the difference between the previous temperature and the current temperature is less than 0 and the absolute value of the difference between the previous temperature and the current temperature is equal to or greater than the first reference value, the cooling power of the compressor 21 is increased by a first level. can

In this embodiment, a plurality of reference values for comparison with the absolute value of the difference between the previous temperature and the current temperature may be set.

For example, when the difference between the previous temperature and the current temperature is greater than 0 and the absolute value of the difference between the previous temperature and the current temperature is greater than or equal to a second reference value greater than the first reference value, the cooling power of the compressor 21 can be reduced by the second level. In addition, when the absolute value of the difference between the previous temperature and the current temperature is greater than or equal to a third reference value greater than the second reference value, the cooling power of the compressor 21 may be reduced by a third level.

Alternatively, when the difference between the previous temperature and the current temperature is less than 0 and the absolute value of the difference between the previous temperature and the current temperature is greater than or equal to a second reference value greater than the first reference value, the cooling power of the compressor 21 is removed. It can be increased by 2 levels. Also, when the absolute value of the difference between the previous temperature and the current temperature is greater than or equal to a third reference value greater than the second reference value, the cooling power of the compressor 21 may be increased by a third level.

In this case, the difference value between the plurality of reference values may be set to be the same or different.

For example, the first reference value may be set to 0.5, the second reference value may be set to 1, and the third reference value may be set to 1.5. Alternatively, the first reference value may be set to 0.5, the second reference value may be set to 0.9, and the third reference value may be set to 1.3.

Also, the difference value between the plurality of levels may be set to be the same or different.

For example, the first level may be set to have a cooling power change value of A, the second level may be set to have a cooling power change value of 2*A, and the third level may be set to have a cooling power change value of 3*A. Alternatively, the first level may have a cooling power change value of A, the second level may be set to B (a greater value than A) rather than 2*A, and the third level may have a cooling power change value of 3*A can be set to C (where B is a large value) instead of .

Meanwhile, in a state in which the cooling power of the compressor 21 is reduced (cooling power 55), the current temperature is sensed after the sampling time, and the difference between the previous temperature and the current temperature is greater than 0 while the difference between the previous temperature and the current temperature is greater than 0. When the absolute value of is equal to or greater than the first reference value, the cooling power of the compressor 21 may be reduced again (cooling power 50).

In addition, in a state in which the cooling power of the compressor 21 is increased (cooling power 65), the current temperature is sensed after the sampling time, the difference between the previous temperature and the current temperature is less than 0, and the difference between the previous temperature and the current temperature When the absolute value of is equal to or greater than the first reference value, the cooling power of the compressor 21 may be increased again (cooling power 70).

As described above, as the temperature of the storage chamber is sensed at each sampling time interval and the cooling power of the cold air supply means is adjusted, the temperature of the storage chamber converges to the set temperature as long as there is no influence of external factors.

In this embodiment, the operation of the refrigerator may include a normal control operation and a constant temperature control operation. The preliminary operation corresponds to the general control operation. The constant temperature control operation is an operation for controlling the cold air supply means based on a difference value (or a first factor) between the previous temperature and the current temperature, and the constant temperature control operation is not based on the first factor (the first factor) irrespective of factors) means an operation to control the cold air supply means.

6 is a flowchart illustrating a method for controlling a refrigerator according to a second embodiment of the present invention.

This embodiment is the same as the previous embodiment in other parts, except that the types of factors for controlling the refrigerator are different. Therefore, only the characteristic parts of the present embodiment will be described below.

Referring to FIG. 6 , steps S1 to S4 described in the first embodiment are equally applied to the control method of this embodiment.

That is, when the refrigerator is turned on, the compressor is stopped after performing a preliminary operation, and when it is determined that the constant temperature control start condition is satisfied, the control for the steady temperature of the storage chamber is performed.

In this case, when the constant temperature control start condition is satisfied, the temperature of the storage chamber may reach a specific temperature within a temperature satisfaction section to be described later. For example, when the temperature of the storage chamber reaches a set temperature of the storage chamber, the compressor may be operated.

And, in the present embodiment, the control step for the constant temperature may include a step (S5) of sensing the temperature of the storage chamber at regular time intervals and a step (S15) of adjusting the output of the cold air supply means.

For example, the control unit 50 adjusts the output of the cold air supply means by using a difference value between the set temperature and the current temperature of the storage room (S15).

At this time, the control unit 50 detects the current temperature of the storage room at regular time intervals, and based on whether the absolute value of the difference between the set temperature and the current temperature is smaller than the first upper limit reference value or the first lower limit reference value, cold air The output of the supply means can be adjusted.

For example, a temperature higher than the set temperature by a first upper limit reference value may be referred to as a temperature upper limit (reference temperature C1), and a temperature lower by the first lower limit reference value than the set temperature may be referred to as a lower temperature limit (reference temperature C2). have.

The first upper limit reference value and the first lower limit reference value may be set to be the same or different.

The first upper limit reference value and the first lower limit reference value may be set to 0.5, or the first upper limit reference value may be set to be greater than or smaller than the first lower limit reference value.

When the absolute value of the difference between the set temperature and the current temperature is smaller than the first lower limit reference value or the first upper limit reference value, the current temperature is lower than the upper temperature limit and higher than the lower temperature limit.

Accordingly, a case in which the current temperature is lower than the upper temperature limit and higher than the lower temperature limit will be described as that the current temperature is located in the temperature satisfaction section.

In addition, the case where the current temperature is higher than the upper temperature limit is described as being located in the section where the current temperature exceeds the upper temperature limit, and the case where the current temperature is lower than the lower temperature limit is described as being located in the section where the current temperature exceeds the lower temperature limit. .

In this case, the upper temperature limit is a temperature value smaller than the on reference temperature A1 and higher than the set temperature, and the lower temperature limit is a temperature value higher than the off reference temperature A2 and lower than the set temperature.

The control unit 50 detects the current temperature at regular time intervals. Accordingly, the predetermined time is a sampling time for determining the temperature change trend.

In this case, the sampling time may be constant or may vary according to the current temperature. For example, when the current temperature is located in the temperature satisfaction section, the first sampling time may be applied as a sampling time for detecting the next current temperature.

On the other hand, when the current temperature is located outside the temperature satisfaction section, a second sampling time longer or shorter than the first sampling time may be applied as a sampling time for detecting the next current temperature.

The controller 50 continues the constant temperature control as long as the power of the refrigerator 1 is not turned off (S7).

7 is a graph for explaining the temperature change of the storage chamber and the output control of the cold air supply means according to the second embodiment.

7 shows, for example, a change in the cooling capacity of the compressor for maintaining the freezing chamber at a constant temperature state and a change in the temperature of the freezing chamber according to the change, and the number on the graph is an example of the cooling capacity of the compressor.

Hereinafter, as an example of the cooling air supply means, the control of the cooling power of the compressor will be described.

Referring to FIG. 7 , after the power of the refrigerator is turned on or the defrosting operation is completed, the compressor 21 may be operated with the maximum cooling power to rapidly lower the temperature of the freezing compartment. And, when the temperature of the freezing chamber reaches the off reference temperature A2, the compressor 21 is stopped.

When the compressor 21 is stopped, the temperature of the freezing compartment rises, and when the temperature of the freezing compartment reaches a set temperature (Notch), control for the constant temperature of the freezing compartment is started.

When the constant temperature control of the freezing compartment is started, at this time, the compressor 21 operates with a pre-set cooling power between the minimum cooling power and the maximum cooling power.

As described above, the temperature of the freezing compartment is sensed at a sampling time interval, and the controller 50 adjusts the cooling power of the compressor 21 based on a difference value between the set temperature and the current temperature.

For example, depending on the temperature of the freezer compartment while the compressor 21 is operating at a cooling power of 60, the cooling power may be maintained (cooling power: 60), decreased (cooling power: 55, 50), or increased (cooling power: 65) have.

For example, when the absolute value of the difference between the set temperature and the current temperature is smaller than the first upper limit reference value or the first lower limit reference value, the controller 50 may maintain the cooling power of the compressor 21 .

For example, when the current temperature is located in the temperature satisfaction section, the cooling power of the compressor 21 may be maintained.

On the other hand, when the current temperature is located in a section exceeding the upper limit of the temperature, the cooling power of the compressor 21 may be increased. In addition, when the current temperature is located in a section exceeding the lower limit of the temperature, the cooling power of the compressor 21 may be reduced.

For example, when the current temperature is located in the range exceeding the lower temperature limit and the absolute value of the difference between the set temperature and the current temperature is greater than the first lower limit reference value and smaller than the second lower limit reference value, the compressor 21 is Cooling power can be reduced by the first level.

Alternatively, when the current temperature is located in the range exceeding the lower temperature limit and the absolute value of the difference between the set temperature and the current temperature is greater than the second lower limit reference value and smaller than the third lower limit reference value, the cooling power of the compressor 21 It can be reduced by the second level.

Alternatively, when the current temperature is located in the range exceeding the lower temperature limit and the absolute value of the difference between the set temperature and the current temperature is equal to or greater than the third lower limit reference value, the cooling power of the compressor 21 may be reduced by a third level. have.

In this case, the second lower limit reference value is greater than the first lower limit reference value, and the third lower limit reference value is greater than the second lower limit reference value.

For example, when the current temperature is located in a section exceeding the upper limit of the temperature, and the absolute value of the difference between the set temperature and the current temperature is greater than the first upper limit reference value and smaller than the second upper limit reference value, the compressor 21 is Cooling power can be increased by a second level.

Alternatively, when the current temperature is located in a section exceeding the upper temperature limit, the absolute value of the difference between the set temperature and the current temperature is greater than the second upper limit reference value and smaller than the third upper limit reference value, the cooling power of the compressor 21 It can be increased by the second level.

In addition, when the current temperature is located in the section exceeding the upper limit of temperature and the absolute value of the difference between the set temperature and the current temperature is equal to or greater than the third upper limit reference value, the cooling power of the compressor 21 can be increased by a third level. have.

In this embodiment, the difference values between the plurality of levels may be set to be the same or different.

For example, the first level may be set to have a cooling power change value of A, the second level may be set to have a cooling power change value of 2*A, and the third level may be set to have a cooling power change value of 3*A. Alternatively, the first level may have a cooling power change value of A, the second level may be set to B (a greater value than A) rather than 2*A, and the third level may have a cooling power change value of 3*A can be set to C (where B is a large value) instead of .

Also, in this embodiment, the difference values between the plurality of upper limit reference values or the plurality of lower limit reference values may be set to be the same or different.

For example, the first upper limit reference value may be set to 0.5, the second upper limit reference value may be set to 1, and the third upper limit reference value may be set to 1.5. Alternatively, the first upper limit reference value may be set to 0.5, the second upper limit reference value may be set to 0.9, and the third upper limit reference value may be set to 1.3.

On the other hand, in a state in which the cooling power of the compressor 21 is reduced (for example, the cooling power is reduced from 60 to 55), the current temperature is sensed after the sampling time, and the current temperature is located in a section exceeding the lower limit of the temperature (set as an example) When the absolute value of the difference between the temperature and the current temperature is greater than the first lower limit reference value and less than the second lower limit reference value), the cooling power of the compressor 21 may be reduced again (for example, the cooling power is reduced from 55 to 50) .

In addition, in a state in which the cooling power of the compressor 21 is increased (for example, the cooling power is increased from 45 to 50), the current temperature is sensed after the sampling time, and when the current temperature is located in a section exceeding the upper limit of the temperature (set as an example) When the absolute value of the difference between the temperature and the current temperature is greater than the second upper limit reference value and smaller than the third upper limit reference value), the cooling power of the compressor may be increased again (for example, the cooling power of the compressor is increased from 50 to 60).

As described above, as the temperature of the storage chamber is sensed at each sampling time interval and the cooling power of the cold air supply means is adjusted, the temperature of the storage chamber converges to the set temperature as long as there is no influence of external factors.

In this embodiment, the operation of the refrigerator may include a normal control operation and a constant temperature control operation. The preliminary operation corresponds to the general control operation. The constant temperature control operation is an operation for controlling the cold air supply means based on a difference value (or a second factor) between the set temperature of the storage room and the current temperature, and the constant temperature control operation is not based on the second factor (the above irrespective of the second factor) refers to the operation of controlling the cold air supply means.

8 is a flowchart illustrating a control method of a refrigerator according to a third embodiment of the present invention.

This embodiment is the same as the previous embodiments in other parts, except that the types of factors for controlling the refrigerator are different. Therefore, only the characteristic parts of the present embodiment will be described below.

Referring to FIG. 8 , steps S1 to S4 described in the first embodiment are equally applied to the control method of this embodiment.

That is, when the refrigerator is turned on, after performing a preliminary operation, the cooling air supply means is stopped, and when it is determined that the steady temperature control start condition is satisfied, control for the steady temperature of the storage chamber is performed.

In this case, when the constant temperature control start condition is satisfied, the temperature of the storage chamber may reach a specific temperature within the temperature satisfaction section. For example, when the temperature of the storage chamber reaches a set temperature of the storage chamber, the cold air supply means may be operated.

In the present embodiment, the control step for the constant temperature may include a step (S5) of sensing the temperature of the storage chamber at regular time intervals and a step (S16) of adjusting the output of the cold air supply means.

In this embodiment, the controller 50 adjusts the output of the cold air supply means for controlling the constant temperature of the storage chamber, and the controller 50 adjusts the output of the cold air supply means based on the temperature of the storage chamber. For example, the control unit 50 may adjust the output of the cold air supply means so that the temperature of the storage chamber is maintained within the temperature satisfaction section.

Specifically, the control unit 50 uses the change in the temperature of the storage compartment described in the first embodiment and the difference between the set temperature and the current storage compartment temperature described in the second embodiment to control the cooling air supply means. Adjust the output (S16).

Therefore, hereinafter, the terms used in the first embodiment and the terms used in the second embodiment are used the same.

In this embodiment, the change in the temperature of the storage chamber uses a difference value between the previous temperature and the current temperature. The temperature change trend of the storage chamber is based on the temperature value of the storage chamber sensed at regular time intervals. Accordingly, the predetermined time is a sampling time for determining the temperature change trend.

According to the first factor (difference value between the previous temperature and the current temperature) and the second factor (difference value between the set temperature and the current temperature) for controlling the output of the cold air supplying means, the output of the cold air supplying means is reduced or the current state can be maintained or increased.

For example, the control unit 50 determines whether to increase, maintain, or decrease the output of the cold air supply means based on the first factor, and determines whether to increase, maintain or decrease the output of the cold air supply means based on the second factor. , it is finally decided whether to increase, maintain, or decrease the output of the cold air supply means by combining the results.

For example, if it is determined to maintain the output of the cold air supply means based on the first factor and it is determined to increase the output of the cold air supply means based on the second factor, the output of the cold air supply means is finally increased increase

As a result of the first factor, it is determined to maintain the output of the cold air supply means, and as a result of the second factor, when it is determined to decrease the output of the cold air supply means, the output of the cold air supply means is finally reduced.

If it is determined to maintain the output of the cold air supply means based on each of the first and second factors, the output of the cold air supply means is finally maintained.

As a result of the first factor, when it is determined to increase the output of the cold air supply means, and as a result, based on the second factor, it is determined to maintain the output of the cold air supply means, the output of the cold air supply means is finally increased.

If, as a result of the first factor, it is determined to decrease the output of the cold air supply means, and as a result of the second factor, it is determined to maintain the output of the cold air supply means, the output of the cold air supply means is finally reduced.

If it is determined to increase the output of the cold air supply means based on each of the first and second factors, the output of the cold air supply means is finally increased.

If, as a result of each of the first and second factors, it is determined to reduce the output of the cold air supplying means, the output of the cold air supplying means is finally reduced.

As a result of the first factor, when it is determined to decrease the output of the cold air supply means, and as a result based on the second factor, it is determined to increase the output of the cold air supply means, the reduced output finally determined based on the first factor It is possible to maintain, increase, or decrease the output of the cold air supply means according to the magnitude of the increased output determined based on the magnitude of and the second factor.

If, as a result of the first factor, it is determined to increase the output of the cold air supply means, and as a result of the second factor, it is determined to decrease the output of the cold air supply means, the increased output finally determined based on the first factor It is possible to maintain, increase, or decrease the output of the cold air supply means according to the magnitude of the reduced output determined based on the magnitude of , and the second factor.

And, after the output of the cold air supply means is determined, the determined output is maintained for the sampling time, and when the sampling time elapses, the output of the cold air supply means is determined again. That is, the output of the cold air supply means may be adjusted for each sampling time interval. Then, the control unit controls the cold air supply means to operate the cold air supply means with the determined output during the sampling time.

The controller 50 continues the constant temperature control as long as the power of the refrigerator 1 is not turned off (S7).

Hereinafter, a specific control method for adjusting the output of the cold air supply means for controlling the constant temperature will be described as an example.

9 to 12 are flowcharts for explaining a method for adjusting the output of the cold air supply means according to the third embodiment.

And, at the start time of the constant temperature control, the output of the cold air supply means is set to a predetermined output between the minimum output and the maximum output (hereinafter referred to as "initial output").

9 to 12 , the control unit 50 controls the cold air supply means to operate at an initial output for constant temperature control in a state where the current temperature of the storage chamber reaches a set temperature. For example, the compressor and the fan driving unit may operate with initial output, and the damper 12 may be opened at an initial angle greater than zero.

When the sampling time elapses while the cold air supply means operates at the initial output, the temperature of the storage chamber is sensed by the temperature sensors 41 and 42 .

Next, the control unit 50 determines whether a difference between the previous temperature and the current temperature of the storage chamber sensed by the temperature sensors 41 and 42 is greater than zero (S51). Here, in the initial stage of the constant temperature control, the previous temperature will be the set temperature.

When the difference between the previous temperature and the current temperature is greater than 0, the temperature of the storage room is falling.

As a result of the determination in step S51, if the difference between the previous temperature and the current temperature is greater than 0, the controller 50 determines whether the difference between the previous temperature and the current temperature is smaller than the first reference value (S52).

As a result of the determination in step S52, when the difference between the previous temperature and the current temperature is smaller than the first reference value, the control unit 50 determines to maintain the output of the cold air supply means as a determination result for the first factor.

Next, the control unit 50 determines whether the difference between the set temperature and the current temperature is less than 0 (S53).

If the difference between the set temperature and the current temperature is less than 0, the current temperature is higher than the set temperature. low case.

As a result of the determination in step S53, when the difference between the set temperature and the current temperature is less than 0, the controller 50 may determine whether the current temperature is located in the temperature satisfaction section (S54).

When the difference between the set temperature and the current temperature is smaller than the unit temperature, the current temperature is a temperature close to the set temperature.

As a result of the determination in step S54, when the current temperature is located in the temperature satisfaction section, the control unit 50 determines to maintain the output of the cold air supply means as a determination result for the second factor.

Accordingly, the control unit 50 finally determines to maintain the current output of the cold air supply means according to the results (S51 and S52) based on the first factor and the results (S53 and S54) based on the second factor (S55).

On the other hand, as a result of the determination in step S54, when the current temperature is not located in the temperature satisfaction section (which is a case in which the temperature exceeds the upper limit of the temperature), the control unit 50 outputs the cold air supply means as the determination result for the second factor decided to increase

Therefore, the control unit 50 finally decides to increase the output of the current cold air supply means according to the results (S51 and S52) based on the first factor and the results (S53 and S54) based on the second factor (S56).

In this case, when the current temperature is located in the section exceeding the upper limit of the temperature, the absolute value of the difference between the set temperature and the current temperature is compared with a plurality of upper limit reference values so that the amount of increase in the output of the cold air supply means is different.

For example, as described in the second embodiment, the absolute value of the difference between the set temperature and the current temperature is greater than the first upper limit reference value while the current temperature is located in the section exceeding the upper temperature limit, and the second upper limit reference value If it is smaller than that, the output of the cold air supply means may be increased by the first level.

Alternatively, when the current temperature is located in the range exceeding the upper temperature limit and the absolute value of the difference between the set temperature and the current temperature is greater than the second upper limit reference value and smaller than the third upper limit reference value, the output of the cold air supply means is suppressed. It can be increased by 2 levels.

In addition, when the current temperature is located in a section exceeding the upper temperature limit and the absolute value of the difference between the set temperature and the current temperature is equal to or greater than the third upper limit reference value, the output of the cold air supply means may be increased by a third level. .

On the other hand, if it is determined in step S53 that the difference between the set temperature and the current temperature is equal to or greater than 0, the controller 50 may determine whether the current temperature is located in the temperature satisfaction section (S61).

As a result of the determination in step S61, if the current temperature is located in the temperature satisfaction section, the control unit 50 determines to maintain the output of the cold air supply means as a determination result for the second factor.

Accordingly, the control unit 50 finally determines to maintain the current output of the cold air supply means according to the results (S51 and S52) based on the first factor and the results (S53 and S61) based on the second factor (S62).

On the other hand, as a result of the determination in step S61, if the current temperature is not located in the temperature satisfaction section (the current temperature is in the temperature lower limit exceeding section), the control unit 50 as a result of the determination of the second factor, It is decided to reduce the output of the cold air supply means.

Therefore, the control unit 50 finally determines to reduce the output of the current cold air supply means according to the results (S51 and S52) based on the first factor and the results (S53 and S61) based on the second factor (S63).

At this time, when the current temperature is located in the section exceeding the lower limit of the temperature, the absolute value of the difference between the set temperature and the current temperature is compared with a plurality of lower limit reference values so that the amount of decrease in the output of the cold air supply means is different.

For example, as described in the second embodiment, the absolute value of the difference between the set temperature and the current temperature is greater than the first lower limit reference value while the current temperature is located in the section exceeding the lower temperature limit, and the second lower limit reference value If it is smaller than that, it is possible to reduce the output of the cold air supply means by the first level.

Alternatively, when the current temperature is located in the section exceeding the upper limit of the temperature, and the absolute value of the difference between the set temperature and the current temperature is greater than the second lower limit reference value and smaller than the third lower limit reference value, the output of the cold air supply means is suppressed. It can be reduced by 2 levels.

In addition, when the current temperature is located in the range exceeding the lower limit of the temperature and the absolute value of the difference between the set temperature and the current temperature is equal to or greater than the third lower limit reference value, the output of the cold air supply means may be reduced by a third level. .

On the other hand, if it is determined in step S52 that the difference between the previous temperature and the current temperature is equal to or greater than the first reference value, the control unit 50 determines to reduce the output of the cold air supply means as a result of determining the first factor .

Then, the control unit 50 may determine whether the difference between the set temperature and the current temperature is greater than 0 (S71).

As a result of the determination in step S71, if the difference between the set temperature and the current temperature is greater than 0, the control unit 50, as a determination result for the second factor, according to the size of the difference between the set temperature and the current temperature ( Depending on whether the current temperature is located in the temperature satisfaction section) it may be determined to maintain the output of the cold air supply means or to decrease.

At this time, when the current temperature is located in the temperature satisfaction section, it can be determined to maintain the output of the cold air supply means, and when the current temperature is not located in the temperature satisfaction section (the current temperature is located in the temperature lower limit exceeding section) ), the level of the decrease in the output of the cold air supply means may be determined according to the absolute value of the difference between the set temperature and the current temperature.

In any case, the control unit 50 finally decides to reduce the output of the current cold air supply means according to the results (S51 and S52) based on the first factor and the result (S71) based on the second factor (S72).

On the other hand, if it is determined in step S71 that the difference between the set temperature and the current temperature is equal to or less than 0, the control unit 50 may determine whether the current temperature is located in the temperature satisfaction section (S73).

As a result of the determination in step S73, if the current temperature is located in the temperature satisfaction section, the control unit 50 determines to maintain the output of the cold air supply means as a determination result for the second factor.

Therefore, the control unit 50 finally determines to decrease the output of the current cold air supply means according to the results (S51 and S52) based on the first factor and the results (S71 and S73) based on the second factor (S74).

On the other hand, when the current temperature is not located in the temperature satisfaction section (the current temperature is located in the temperature upper limit exceeding section), the control unit 50 increases the output of the cold air supply means as a result of determining the second factor decide to do

In this case, the control unit 50 may maintain, increase or decrease the output of the cold air supply means according to the results (S51 and S52) and the results (S71 and S73) based on the first factor (S71 and S73). can be (S75).

For example, according to the magnitude of the output of the cold air supply means that is decreased as a result of the first factor and the magnitude of the output of the cold air supply means that is increased as a result of the second factor, the output of the cold air supply means is maintained, increased, or decreased. It can be decided whether

That is, when the output of the cold air supply means, which is decreased as a result of the first factor, and the output of the cold air supply means, which is increased as a result of the second factor, is the same, the control unit 50 finally maintains the output of the cold air supply means. can decide

Alternatively, when the output of the cold air supply means, which is reduced as a result of the first factor, is greater than the output of the cold air supply means, which is increased as a result of the second factor, the control unit 50 finally reduces the output of the cold air supply means. it can be decided that

Alternatively, when the output of the cold air supply means, which is decreased as a result of the first factor, is smaller than the output of the cold air supply means, which is increased as a result of the second factor, the control unit 50 finally increases the output of the cold air supply means. it can be decided that

Meanwhile, as a result of the determination in step S51, when the difference between the previous temperature and the current temperature is 0 or less, the controller 50 may determine whether the difference between the previous temperature and the current temperature is smaller than the first reference value (S81). ).

Here, when the difference between the previous temperature and the current temperature is 0 or less, the temperature of the storage chamber is maintained for the sampling time or the temperature is increased.

As a result of the determination in step S81, when the difference between the previous temperature and the current temperature is smaller than the first reference value, the control unit 50 determines to maintain the output of the cold air supply means as a determination result based on the first factor.

Then, the control unit 50 determines whether the difference between the set temperature and the current temperature is greater than 0 (S82).

As a result of the determination in step S82, when the difference between the set temperature and the current temperature is greater than 0, it is determined whether the current temperature is located in the temperature satisfaction section (S83).

As a result of the determination in step S83, if the current temperature is located in the temperature satisfaction section, the control unit 50 determines to maintain the output of the cold air supply means as a determination result based on the second factor.

Accordingly, the control unit 50 finally determines to maintain the output of the current cold air supply means according to the results (S51 and S81) based on the first factor and the results (S82 and S83) based on the second factor (S84).

On the other hand, as a result of the determination in step S83, when the current temperature is not located in the temperature satisfaction section (the current temperature is located in the temperature lower limit exceeding section), the controller 50 determines the cold air as a result of the determination based on the second factor. It is decided to reduce the output of the supply means.

Accordingly, the control unit 50 finally determines to reduce the output of the current cold air supply means according to the results (S51 and S81) based on the first factor and the results (S82 and S83) based on the second factor (S85).

On the other hand, when the difference between the set temperature and the current temperature is 0 or less as a result of determination in step S82, the control unit 50 determines whether the current temperature is located in a temperature satisfaction section (S86).

As a result of the determination in step S86, when the current temperature is located in the temperature satisfaction section, the control unit 50 determines to maintain the output of the cold air supply means as a determination result based on the second factor.

Accordingly, the control unit 50 finally determines to maintain the output of the current cold air supply means according to the results (S51 and S81) based on the first factor and the results (S82 and S86) based on the second factor (S85).

On the other hand, as a result of the determination in step S86, if the current temperature is not located in the temperature satisfaction section (the current temperature is located in the temperature upper limit exceeding section), the control unit 50 sets as a determination result based on the second factor According to the comparison of the absolute value of the difference between the temperature and the current temperature with the plurality of reference values, it is possible to determine the output increase level of the cold air supply means.

Therefore, the control unit 50 finally determines to increase the output of the current cold air supply means according to the results (S51 and S81) based on the first factor and the results (S82 and S86) based on the second factor (S88).

Meanwhile, if it is determined in step S81 that the difference between the previous temperature and the current temperature is equal to or greater than the first reference value, the control unit 50 determines to increase the output of the cold air supply means as a result based on the first factor.

Then, the control unit 50 may determine whether the difference between the set temperature and the current temperature is greater than 0 (S91).

As a result of the determination in step S91, if the difference between the set temperature and the current temperature is greater than 0, the controller 50 may determine whether the current temperature is located in the temperature satisfaction section (S92).

As a result of the determination in step S92, if the current temperature is located in the temperature satisfaction section, the control unit 50 determines to maintain the output of the cold air supply means as a result based on the second factor.

Accordingly, the control unit 50 finally determines to increase the output of the current cold air supply means according to the results (S51 and S81) based on the first factor and the results (S91 and S92) based on the second factor (S93).

On the other hand, when the current temperature is not located in the temperature satisfaction section (the current temperature is in the temperature lower limit exceeding section), the control unit 50 decreases the output of the cold air supply means as a result of determining the second factor decide to do

In this case, the control unit 50 maintains, increases or decreases the output of the cold air supply means according to the results (S51 and S81) based on the first factor and the results (S91 and S92) based on the second factor. can be (S94).

For example, according to the magnitude of the output of the cold air supplying means that is increased as a result of the first factor and the magnitude of the output of the cold air supplying means that is decreased as a result of the second factor, the output of the cold air supplying means is maintained, increased, or decreased. It can be decided whether

That is, when the output of the cold air supply means increased as a result of the first factor and the output of the cold air supply means that is decreased as a result of the second factor are the same, the control unit 50 finally maintains the output of the cold air supply means. can decide

Alternatively, when the output of the cold air supply means increased as a result of the first factor is greater than the output of the cold air supply means that is decreased as a result of the second factor, the control unit 50 finally increases the output of the cold air supply means. it can be decided that

Alternatively, when the output of the cold air supply means increased as a result of the first factor is smaller than the output of the cold air supply means that is decreased as a result of the second factor, the control unit 50 finally reduces the output of the cold air supply means. it can be decided that

On the other hand, if the difference between the set temperature and the current temperature is 0 or less as a result of the determination in step S91, the control unit 50 according to the magnitude of the absolute value of the difference between the set temperature and the current temperature, as a result based on the second factor , it may be determined to maintain or increase the output of the cold air supply means.

In this case, when the absolute value of the difference between the set temperature and the current temperature is smaller than the first reference value, it may be determined to maintain the output of the cold air supply means.

When the absolute value of the difference between the set temperature and the current temperature is equal to or greater than the first reference value, the level of increase in the output of the cold air supply means may be determined according to the comparison of the absolute value of the difference between the set temperature and the current temperature with the plurality of reference values.

In any case, the control unit 50 finally determines to increase the output of the current cold air supply means according to the results (S51 and S52) and the second factor (S91) based on the first factor. (S95).

13 is a graph for explaining a temperature change in a storage chamber and an output control of a cold air supply means according to the third embodiment.

13 shows, for example, a change in the cooling capacity of a compressor for maintaining the freezing chamber at a constant temperature state and a change in the temperature of the freezing chamber according to the change in the cooling capacity of the compressor.

Referring to FIG. 13 , after the power of the refrigerator is turned on or the defrosting operation is completed, the compressor 21 may be operated with the maximum cooling power to rapidly lower the temperature of the freezing compartment. And, when the temperature of the freezing chamber reaches the lower limit temperature (-Diff) which is the freezing chamber temperature range, the compressor 21 is stopped.

When the compressor 21 is stopped, the temperature of the freezing chamber rises, and when the temperature of the cold storage chamber reaches a preset temperature (Notch), control for the constant temperature of the freezing chamber is started.

As described above, the temperature of the freezing compartment is sensed at sampling time intervals, and the control unit 50 adjusts the cooling power of the compressor 21 based on the first and second factors.

For example, while the compressor 21 is operating at a cooling power of 60, depending on the temperature of the freezer compartment, the cooling power is maintained (cooling power: 60), decreasing (cooling power: 55, 45, 40, 35), or increasing (cooling power: 70, 65).

At this time, when the refrigerator door is opened to increase the temperature of the storage compartment, or when food is additionally introduced into the storage compartment, when the storage compartment is overheated and the temperature of the storage compartment becomes higher than the on-reference temperature A1, the control unit 50, It is possible to control the cold air supply means to operate at a maximum output so that the temperature of the storage chamber is rapidly lowered.

For example, the control unit 50 may control the cooling air supply means to operate at maximum output during the sampling time or until the temperature of the storage chamber reaches a specific temperature within the temperature satisfaction section.

As described above, as the temperature of the storage chamber is sensed at each sampling time interval and the cooling power of the cold air supply means is adjusted, the temperature of the storage chamber converges to the set temperature as long as there is no influence of external factors.

In order to maintain the temperature of the storage chamber in a state close to the set temperature, the output of the cold air supply means may be maintained at a specific output through an output control process.

According to the proposed invention, since the temperature of the storage chamber can be kept constant, there is an advantage that the storage period of food can be extended. That is, there is an advantage in that the phenomenon that the food stored in the storage compartment is overcooled or withered can be eliminated.

In addition, in order to keep the temperature of the storage room constant, since the cold air supply means does not stop and maintains the driving state (continuous operation), there is an effect of reducing power consumption due to the initial start of the cold air supplying means.

In addition, based on the difference between the previous temperature and the current temperature and the difference between the set temperature and the current temperature, the output of the cold air supply means is adjusted, so that when the temperature of the storage room is out of the steady temperature state, it can be quickly restored to the steady temperature state. there are advantages to

1: Refrigerator 11: Cabinet
111: freezer compartment 112: refrigerator compartment
12: damper 13: damper driving unit
21: compressor 25: fan drive unit
26: fan 50: control unit

Claims (15)

when the power of the refrigerator is turned on, the control unit operating the cold air supply means with a preset first output value;
when the temperature of the storage chamber reaches an off reference temperature (A2) lower than the set temperature of the storage chamber, the control unit stopping the cold air supply means;
operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and
and controlling, by the controller, an output of the cold air supply means based on the increase or decrease in the temperature of the storage chamber sensed by the temperature sensor at sampling time intervals while the cold air supply means operates at the second output value. . The method of claim 1,
When the absolute value of the difference between the previous temperature and the current temperature is less than the first reference value, the control unit maintains the cooling power of the cold air supply means,
When the absolute value of the difference between the previous temperature and the current temperature is equal to or greater than the first reference value, the control method of the refrigerator for increasing or decreasing the cooling power of the cold air supply means. when the power of the refrigerator is turned on, the control unit operating the cold air supply means with a preset first output value;
when the temperature of the storage chamber reaches the off-reference temperature A2 lower than the set temperature of the storage chamber, the control unit stopping the cold air supply means;
operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and
and adjusting the output of the cold air supply unit based on a difference between the set temperature of the storage compartment and the current temperature of the storage compartment at sampling time intervals while the cooling air supply unit operates with a second output value. Way. 4. The method of claim 1 or 3,
The predetermined temperature is the set temperature. 4. The method of claim 1 or 3,
The preset first output value is the maximum output of the cold air supply means. 4. The method of claim 1 or 3,
The sampling time is constant or variable according to a current temperature. 7. The method of claim 6,
When the current temperature is located in the first temperature section, the first sampling time is applied as a sampling time for detecting the next current temperature,
When the current temperature is located in the second temperature section, a second sampling time longer or shorter than the first sampling time is applied as a sampling time for detecting the next current temperature. when the power of the refrigerator is turned on, the control unit operating the cold air supply means with a preset first output value;
stopping, by the controller, the cold air supply means when the temperature of the storage chamber reaches a predetermined value;
operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and
and controlling, by the controller, an output of the cold air supply means based on the increase or decrease in the temperature of the storage chamber sensed by the temperature sensor at sampling time intervals while the cold air supply means operates at the second output value. . 9. The method of claim 8,
The predetermined value is a control method of a refrigerator including an off reference temperature (A2) lower than the set temperature of the storage compartment. 9. The method of claim 8,
The predetermined temperature is a control method of a refrigerator including a value different from the predetermined value. 11. The method of claim 10,
The predetermined temperature is a control method of a refrigerator including a value higher than the predetermined value. when the power of the refrigerator is turned on, the control unit operating the cold air supply means with a preset first output value;
stopping, by the control unit, the cold air supply means when the temperature of the storage chamber reaches a predetermined value;
operating, by the control unit, the cold air supply means at a second output value lower than the preset first output value when the temperature of the storage chamber reaches a predetermined temperature; and
While the cold air supply means is operating at the second output value, the control unit adjusts the output of the cold air supply means based on the difference between the set temperature of the storage chamber and the current temperature of the storage chamber at sampling time intervals. How to control the refrigerator. 13. The method of claim 12,
The predetermined value is a control method of a refrigerator including an off reference temperature (A2) lower than the set temperature of the storage compartment. 13. The method of claim 12,
The predetermined temperature is a control method of a refrigerator including a value different from the predetermined value. 15. The method of claim 14,
The predetermined temperature is a control method of a refrigerator including a value higher than the predetermined value.

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